Rock drill



Sept. 20, 1932. I W A SMITH 5 I ROCK DRILL Filed OGl.. 24, 1928 11 y & l'

. Y INVENTOR.

BYM

- g g ATTORNEY Patented Sept. 20, 1932 UNETE TS P 1? iii WILLIAM SMITH, $3., or EASTON, PENNSYLVANIA, assrenoitro ritennso nr-neun COMPANY, on JERSEY (any, new JERSEY, eoonr ona rron or. GERMANY ROCK :oRILr Application filed October 24,1928. s riai nti eraser,

maintaining these elements in the correct operative position relatively to the cylinder. A method frequently employed for this purpose is to provide the valve chest, the rotation mechanism and the elements between which these parts are disposedwith apertures so 10- cated that they will be in alignment in the assembled position of the parts. A key or pm I isthen disposed in the apertures to assure the correct relative positions-of the parts.

partly broken away Objectionable disadvantages result from this form of construction, such as losing the pin whendisassembling the drill and the pin becomes battered during handling, thus fre-' quently causing considerable delay in refinishing the pin or in supplying a substitute in. p The present invention contemplates the elimination of the aforesaid undesirable features in structures of this type and one of its objects is to enable the rock drill to be readily assembled with a minimum of efiort and time. Another object is to eliminate extensive and costly machining operations on the parts intended to be secured in the drill.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing showing a practical embodiment of the invention and in which similar reference characters refer to similar parts, 0

Figure lis an elevation of a rock drill Figure 2 is a transverse view taken through Figure 1 on the line 22 looking 1n the'direction indicated by the arrows, and

Figure 3 is a plan view of the back head of the drill showing the arrangement of the side bolts on opposite sides of the drill. Referring more particularly to the drawing, A designates generally a rock drill comprising a cylinder ahd back,

heads .6 and Drespectivelywhichare. se-

cured to the cylinder B by means of side bolts E; The sidebolts E-are disposed-on. diametg rically opposite sides of the drill Agandgin this instance haVeheads'F which-seat; upon the back head 11' Theopp ositeor forward ends G of the side boltsare threaded for the reception of nuts H, one on each bolt {of which bears against lugs J of-the front head for clamping the frontfheadto the cylinder.

The outer nuts H serve only. as looking nuts for preventing unthreading of. th t f the bolts E. r

In accordance with-the-present invention .Cti

an enlargement is formed atthe rearward 1 end of the cylinder B, and in said enlargement K is a bore L for the reception of a valve chest which forms in this instance a closure for the rearward end ofthe cylin der B. j

The valve chest comprises'in this instance a pair of plates P and Q havingapertures B through which extends the rifle bar S whereby rotary movement may be transmitted to 3 a hammer piston T in the cylinder B for the purpose of changing the position of the working implement (not shown) which the.

drill is intended to actuate.

The rifle bar S has the usual head U which carries pawls V adapted for engagement with a rotation ratchet W'for lnducing r0- tative movement of the working implement. The rotation ratchet W isinterposed between the valve chest 0 and the back head -D and, like the valve chest 0, is encased by the en largement K of the cylinder.

In order that the valve chest 0 and the rotation ratchet W may be conveniently held in the operativeposition in the bore L said rotation ratchet and valve chest are provided with notches X and Y in opposite sides thereof. These notches X and Y are so located that they will register with each other and alsowith apertures Z and Z) in the back head and' the enlargement K respectively and through which the side bolts E extend. The

notches X and Y engage'theside bolts E thus assuring the correct position of the roi V tation ratchet Vi and the valve chest 0 with respect to the adjacent parts or elements wherewith they are associated.

Due to the present invention the use of separate locking means for the valve chest and rotation ratchet has been entirely elimr inated, and the side bolts-E-which are standard parts of'drills' of this type are utilized 'for the purpose of locking, these elements securely to the drill. i 1

I clainii 1. In a rockdrill, the conibination of a Y cylinder having apertures thereinand a back I cylinder and back head having apertures,

head having aperturescoaxial with the aper l tures in the cylinder, .a rotation ratchet in 15 the cylinder having notches, and side bolts extendingthrough the apertures of the cylinder and, back head andengaging the notches for holding the rotationratchet in operative position relatively to the cylinder.

2. :In a rock drill," the combination of a 5 an enlargement on the cylinder having apertures to register with the'apertures in the 7 back head;-"side' bolts for clamping the cylinder and the back head together, a valve chest 1 in the cylinder, and a rotation ratchet inter posed betweenthevalve chest: and the back head, said" valve chest and said rotation ratchet having notches engaging the side bolts for holding the rotation ratchet and the v valve chest in operative position in the cylinder.

In testimony whereofhave signed this specification.

WILLIAM A. sMiTH, SR: 

